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Financial Instruments (Schedule of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Mar. 31, 2006
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 343,987 | $ 374,388 |
Less: current portion | (30,355) | (1,263) |
Long-term debt, net of current portion | 313,632 | 373,125 |
Convertible Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 27,842 | 27,228 |
Debt issued | 28,437 |  | 180,000
Interest rate | 2.25% |  |
Year of maturity | 2026 |  |
Private Placement, Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 150,000 | 150,000 |
Interest rate | 6.84% |  |
Maturity date | Oct. 25, 2017 |  |
Maturity date range, start | 2013 |  |
Maturity date range, end | 2017 |  |
Credit Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 156,000 | 187,000 |
Interest rate at end of period | 3.66% | 3.61% |
Year of maturity | 2015 |  |
Various Notes and Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | $ 10,145 | $ 10,160 |
Interest rate at end of period | 3.06% | 3.05% |
Year of maturity | 2021 |  |

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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- Definition Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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